Question

i have the following code

class Application
{
    protected $db;
    public function getDBChange(database $db)
        {
            $this->db =& $db;
                $this->update($db);
        }
protected function update($db)
    {
        $this->db=& $db;
        echo "\nServer - update- IN";
        $SQL = "UPDATE `version` SET app_ver='1.0.6'";

        if (!$this->db->query($SQL))
        {
            echo "\nDatabase Error.";
        }
        echo "\nServer - update- OUT";
    }
}

it works properly but when I called this update function from a child class it gives error the child class as follow

class DemoApplication extends Application
{
    callParent()
    {
        $this->update($this->db);
    }
}

when i use this way it gives Error Fatal error: Call to a member function query() on a non-object in

Answer 1

That’s because $db doesn’t have a query() method. Is $this->db actually set and of an object that has a query() method?

Do some debugging:

var_dump($this->db);